铁板电絮凝联合活性炭吸附处理含铬电镀废水的研究

摘要

Electro-flocculation device with iron plate as electrode material was used to treat chromium-containing electroplating wastewater,and the effects of current density,flocculation time and initial pH value on Cr(Ⅵ) removal rate in electroplating wastewater were studied.Results showed that the removal efficiency of Cr(Ⅵ) in electroplating wastewater was better when current density was 20 mA/cm2,flocculation time was 40 min and initial pH value was 4～6.Advanced treatment of wastewater after electrocoagulation by adsorption method with activated carbon as adsorbent,the mass concentration of Cr (Ⅵ),total chromium mass concentration and effluent pH value all meet the emission limit requirements in the emissionstandard of pollutants for electroplating (GB 21900-2008).%采用以铁板为电极材料的电絮凝装置处理含铬电镀废水.研究了电流密度、絮凝时间、初始pH值等工艺条件对废水中Cr(Ⅵ)去除率的影响.结果表明:当电流密度为20 mA/cm2、絮凝时间为40 min、初始pH值为4～6时,对废水中Cr(Ⅵ)的去除效果较好.采用活性炭吸附法对电絮凝出水进行深度处理,处理后废水中Cr(Ⅵ)的质量浓度、总铬的质量浓度、出水pH值均满足《电镀污染物排放标准》(GB 21900-2008)中相关的排放标准限值要求.